| Swansea to Sesimbra | 4,216.11 mi (6,785.17 km) |
| Swansea to Setubal | 4,223.37 mi (6,796.85 km) |
| Swansea to Sever do Vouga | 4,177.33 mi (6,722.77 km) |
| Swansea to Silves | 4,289.20 mi (6,902.80 km) |
| Swansea to Sines | 4,243.33 mi (6,828.97 km) |
| Swansea to Sintra | 4,190.84 mi (6,744.51 km) |
| Swansea to Sobrado de Paiva | 4,172.52 mi (6,715.02 km) |
| Swansea to Sobral de Monte Agraco | 4,195.06 mi (6,751.29 km) |
| Swansea to Soure | 4,186.54 mi (6,737.59 km) |
| Swansea to Tabua | 4,204.92 mi (6,767.17 km) |
| Swansea to Tavira | 4,329.53 mi (6,967.70 km) |
| Swansea to Tomar | 4,211.13 mi (6,777.16 km) |
| Swansea to Tondela | 4,197.41 mi (6,755.08 km) |
| Swansea to Torre de Moncorvo | 4,219.64 mi (6,790.86 km) |
| Swansea to Torres Novas | 4,209.92 mi (6,775.22 km) |
